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AssigneeCMD Corporation
InventorsPaul A. Selle, Kenneth C. Radtke, Charles H. Sauder, Paul A. Johnson, Christopher Lee White, Arvid R. Johnson, Gregory T. Prellwitz, Michael J. Stickney, Thomas C. Jansen, Christopher A. Saucier, Terry L. Leitzke, Bradley J. Schmoll
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A machine and method for making bags is described and includes a web traveling from an input section to a rotary drum, to an output section. The rotary drum includes at least one seal bar, having a first sealing zone, and an adjacent weakening zone. The weakening zone may be a heated perforator, includes a heating wire, or be disposed to create an auxiliary sealed area. The heating wire can have, connected thereto, a source of power that is at an adjustable voltage or magnitude, and/or pulsed, and/or a feedback loop. The heating wire may be an NiCr wire and make intermittent contact with the web and be disposed in an insert. The weakening zone may create a line of weakness that is uniform or varies in intensity, is a separating zone, or includes a heat film, a toothed blade, a row of pins, a source of air, or a source of vacuum. The sealing zones may include temperature zones, cartridge heaters, cooling air, or heated air, or a source of ultrasonic, microwave or radiative energy.
A perforator for a rotary bag machine comprising an insert for a rotary drum including a weakening zone, wherein the perforator includes a heating wire, and further wherein the insert is a glass mica ceramic with the wire disposed therein, and further wherein the insert has a plurality of holes disposed along a line in the cross direction.
A retrofit for a rotary drum bag machine that makes bags from a web, comprising a seal bar, including a first sealing zone, and further includes a weakening zone adjacent the first sealing zone, wherein the weakening zone is a heated perforator including a heating wire disposed in a plurality of holes disposed along a line in the cross direction in an insert adjacent the first sealing zone.
A retrofit for a seal bar on a rotary drum bag machine that makes bags from a web, wherein the seal bar includes including a first sealing zone, comprising, a weakening zone adjacent the first sealing zone, wherein the weakening zone is a heated perforator including a heating wire disposed in a plurality of holes disposed along a line in the cross direction in an insert adjacent the first sealing zone.
Dependencies are inferred from the claim text.